(19)

(11)

EP 3 684 977 A1

(12)

(43) Date of publication: 29.07.2020 Bulletin 2020/31 (21) Application number: 18858615.0 (22) Date of filing: 20.09.2018

(51) International Patent Classification (IPC):  E01C 23/088(2006.01) E01C 23/02(2006.01) G05B 19/04(2006.01) E01C 23/12(2006.01) E01C 23/06(2006.01) B23Q 11/08(2006.01) (86) International application number: PCT/US2018/051875 (87) International publication number: WO 2019/060497 (28.03.2019 Gazette 2019/13)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 22.09.2017 US 201762561991 P (71) Applicant: Roadtec, Inc. Chattanooga, TN 37405 (US)	(72) Inventors: PAYNE, Byron Chattanooga, TN 37421 (US) BEVILL, James H. Lookout Mountain, GA 30750 (US) HARRELSON, Raleigh Tuolumne, CA 95379 (US) (74) Representative: Murgatroyd, Susan Elizabeth et al Baron Warren Redfern 1000 Great West Road Brentford TW8 9DW Brentford TW8 9DW (GB)